JPS6345481B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention can be used as a gas scroll compressor in refrigeration compressors, air conditioning compressors, air compressors, etc. The present invention relates to a scroll fluid machine that can be used as an expander for gas.

[Conventional technology]

For conventional scroll fluid machines, for example, JP-A-55
As shown in JP-A-46081 and JP-A-51-117304, a rotation prevention mechanism using a pin engagement part is provided between the frame and the orbiting scroll,
A configuration is adopted in which the crank pin of the crankshaft and the orbiting scroll are connected through a pin engaging portion. The latter publication also states that in order to connect a swinging link to the crankshaft to cancel out part of the centrifugal force,
It uses a ball joint.

[Problem to be solved by the invention]

In the above-mentioned prior art, the orbiting scroll rotates with an inclination when internal pressure is generated during operation due to the dimensional accuracy and perpendicularity of each part during processing. This inclined rotation of the orbiting scroll has a structure in which the pin engagement portion of the rotation prevention mechanism or the pin engagement portion between the orbiting scroll and the crank pin tends to cause uneven contact. As a result, seizure or abnormal wear of the pin engaging portion occurs, resulting in a problem of lowering the reliability of the scroll fluid machine.

The present invention has been made based on the above-mentioned problems, and an object of the present invention is to provide a scroll fluid machine that can tolerate uneven contact of the pin engaging portion or the crank pin portion.

[Means to solve the problem]

The above-mentioned object of the present invention is to provide a mechanism in which one or both of a pin engaging part and a crank pin engaging part constituting an anti-rotation mechanism is engaged with the pin so as to be movable along its axis, and has a spherical outer peripheral surface. This is achieved by providing a self-aligning bearing consisting of an inner ring having a spherical surface that engages with the outer peripheral surface of the inner ring and an outer ring that is fixed to a member facing the pin.

[Effect]

When the orbiting scroll member rotates with an inclination due to the internal pressure generated during scroll operation, the self-aligning bearing allows the orbiting scroll member to rotate by axial movement of the inner ring and rolling motion of the inner ring with respect to the outer ring. At this time, since the inner ring and outer ring constituting the self-aligning bearing only move simply, the lifespan against uneven contact can be improved.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The drawing shows an embodiment of the scroll fluid machine of the present invention, and in this drawing, 1 is a fixed scroll member, 1a is a fixed scroll lap, 2 is an orbiting scroll member, 2a is an orbiting scroll lap, and 3 is a discharge. Port, 4 is fluid pocket, 5 is frame, 6 is pin, 7 is ring, 7a is eccentric hole,
8 is a round hole, 9 is a crankshaft, 9a is a crank pin, 10 is an intake port, and 11 is a frame bearing. The symbol ε in the figure is the orbiting radius of the orbiting scroll member, and the eccentricity of the crankshaft 9 and the pin 6
and the distance between the center axes of the ring 7, so when the crankshaft 9 is driven and rotates, the orbiting scroll member 2 rotates without rotating, and the fluid flows in from the suction port 10 and is confined in the fluid pocket 4. is compressed and discharged from the discharge port 3. When the crankshaft 9 is reversed, fluid flows in from the discharge port 3, expands and is discharged from the suction port 10.

A self-aligning bearing having a self-aligning mechanism is provided at the pin engaging portion of the crank pin 9a and the pin 6. That is, the self-aligning bearing is movable along the pin 9a at the pin engaging portion of the crank pin 9a, and has an inner ring 13 whose outer peripheral surface is formed of a spherical surface.
The outer ring 14 has a spherical surface that engages with the outer peripheral surface of the inner ring, and is fixed to the orbiting scroll member 2, and is movable along the pin 6 at the pin engagement part, and has a spherical surface on its outer peripheral surface. an inner ring 12 having
It is composed of a ring 7 that engages with this, and this ring 7 also serves as an outer ring. Since the shape of the boundary surface between the inner ring and the outer ring forms part of a spherical surface, the central axes of the inner ring and outer ring can be tilted relatively freely.

When the crankshaft 9 supported by the frame bearing 11 is driven and rotated, the orbiting scroll member 2 rotates, and the fluid flowing in from the suction port 10 is confined in the fluid pocket 4, compressed, and discharged from the discharge port 3. be done. If the crankshaft is reversed, the fluid will flow in from the discharge port 3,
It expands and is discharged from the suction port 10. A plurality of anti-rotation mechanisms are provided, each consisting of a pin 6, an inner ring 12, a ring 7, and a round hole 8, to prevent the orbiting scroll member 2 from rotating. The pin 6 is engaged with the inner ring 12, and the crank pin 9a and the inner ring 13 are engaged with each other with a slight gap.

In such a structure, the pin 6 and the inner ring 12
No uneven contact occurs at the interface between the crank pin 9a and the inner ring 13. In other words, uneven contact caused by a decrease in the machining accuracy of parts or deflection of the orbiting scroll member can be tolerated by the movement of the inner rings 12, 13 along the pins 6, 9a and the rolling motion of the inner rings 12, 13. do. Therefore, seizure or abnormal wear of the pin engaging portion does not occur.

In this embodiment, the pin 6 is attached to the orbiting scroll member 2, but the pin 6 may be provided on the frame 5 side and the round hole 8 may be provided on the orbiting scroll member 2 side. It may be arranged between opposing end surfaces of the fixed scroll member 1 and the orbiting scroll member 2. Further, even if the self-aligning bearing is provided only on either the pin portion or the crank pin portion, each has its own effects.

〔Effect of the invention〕

As explained above, according to the present invention, since self-aligning bearings are used in the engaging parts of the pin and crank pin, uneven contact in these parts can be prevented, and therefore seizure or abnormal wear can be prevented. It is possible to realize a highly reliable scroll fluid machine that does not generate any

[Brief explanation of the drawing]

The drawing is a longitudinal cross-sectional view of essential parts showing an embodiment of a scroll fluid machine according to the present invention. 6...Pin, 7...Ring, 12...Inner ring, 9
a... Crank pin, 13... Inner ring, 14... Outer ring.

Claims (1)

[Claims] 1. An orbiting scroll member having a wrap formed in an involute or a curved shape close to an involute and a fixed scroll member are joined so that the wraps of the two engage with each other, and the orbiting scroll member is placed between the frame and the fixed scroll member. A rotation prevention mechanism constituted by a pin engaging portion is provided between the opposing end surfaces of the orbiting scroll member and the frame or between the opposing end surfaces of the fixed and orbiting scroll members, and In a scroll fluid machine in which a pin is connected to the pin by an engaging part, either or both of the pin engaging part and the crank pin engaging part constituting the rotation prevention mechanism are movable in the axial direction of the pin. A self-aligning bearing is used, which includes an inner ring that is engaged with the inner ring and has a spherical surface on its outer peripheral surface, and an outer ring that has a spherical surface that engages with the outer peripheral surface of the inner ring and is fixed to a member facing the pin. A scroll fluid machine characterized by: